6 files declare their use of EntityFormDisplay

ContentEntityForm.php in core/lib/Drupal/Core/Entity/ContentEntityForm.php
EmbeddedForm.php in core/modules/field_layout/tests/modules/field_layout_test/src/Form/EmbeddedForm.php
EntityFormDisplayAccessControlHandlerTest.php in core/tests/Drupal/Tests/Core/Entity/Access/EntityFormDisplayAccessControlHandlerTest.php
ManageFieldsMultipleTypesTest.php in core/modules/field_ui/tests/src/Functional/ManageFieldsMultipleTypesTest.php
MultipleValueWidgetTest.php in core/modules/field/tests/src/FunctionalJavascript/MultipleValueWidgetTest.php
MultipleWidgetFormTest.php in core/modules/field/tests/src/Functional/MultipleWidgetFormTest.php

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.